Question

A sum of money amounts to rs52,080 in 2 years and to rs77,280 in 7 years, at simple intrest. Find the sum and rate percentage of interest ​

Answer 1

$\huge \bigstar \mathfrak \green{heya }:$

⭐solution:

let the sum be p and rate be r

then amount { p +prt /100} = 52080

= 100p +2pr 5208000 .............(1)

for second equation

100 + 7pr = 7728000 ................(2)

from the first and second equation

2pr= 5208000

7pr = 7728000

so putting this value in 1 we get

100p+2×504000=5208000

100p+ 1008000 = 5208000

100p = 5208000- 1008000

p = 42000

so r = 50400/42000

r = 12 percent

hence the correct value of p is 12

⭐At end:

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